The Silurian Shiniulan Formation in the south of the Shichuan Basin was deposited on the carbonate platform developed based on a flat shelf.

• 四川盆地南部下志留统石牛栏组为在缓坡陆棚基础上发育起来的碳酸盐台地的沉积,可划分出4个岩性段和2个沉积旋回。